The Welsh may be the truest Britons according to new genetic research

The scientists found Caucasians in Britain can be divided into 17 genetic groups living in different parts of the country, as shown in the diagram above. Each group had varying amounts of European DNA in their genes

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Blood of the Irish: What DNA Tells Us About the Ancestry of People in Ireland

Medieval map of Ireland, showing Irish tribes. The latest research into Irish DNA has confirmed that the early inhabitants of Ireland were not directly descended from the Keltoi of central Europe. In fact the closest genetic relatives of the Irish in Europe are to be found in the north of Spain in the region known as the Basque Country. These same ancestors are shared to an extent with the people of Britain - especially the Scottish.